An ordinary private gas filling station, at prices cheaper than Belarusian oil, but I will not say about the quality of gas. It seems that the more butane components in the fuel, the better. I looked at the composition of the gas there twice, the first time it was like 62% butane, the second time 45%. How much should I not have Googled, if you're interested, see for yourself. A big plus is that the composition of the gas batch is pasted on the window, which is not present on Belarusian oil.